Chromosomes have lined up on the metaphase plate. During anaphase (b), the sister chromatids are pulled apart and move toward opposite poles of the cell.
In other cases, each parent provides a different allele of a given gene, and the offspring is referred to as heterozygous ("hetero" meaning "different") for that allele. Alleles produce phenotypes (or physical versions of a trait) that are either dominant or recessive.
The two atria are thin-walled chambers that receive blood from the veins. The two ventricles are thick-walled chambers that forcefully pump blood out of the heart. The right atrium receives deoxygenated blood from systemic veins; the left atrium receives oxygenated blood from the pulmonary veins.
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Answer:
A useful model for enzyme action is the Lock and Key model.
Explanation:
The Lock and Key model or theory was first postulated by <u>Emil Fischer</u> in 1894. It is used to represent the enzyme and its specific substrate. The enzyme (lock) is specifically activated by the substrate (key) through its active site (key hole) to produce a catalyzed reaction. If the keys are too small or too big for the key hole, it will not produce any reaction.
The Double Helix model by Watson and Crick is used to represent the DNA present in an individual. This is made up of <u>two strands of DNA</u> bounded by hydrogen bonds. In between these bonds are nitrogenous bases <u>adenine (A), guanine (G), thymine (T), and cytosine (C).</u>
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The Ball and Socket model represents body joints, specifically the hip and the shoulder joints. The shape of the <u>head of the joint is spherical</u> and <u>fits into a cup-like depression of the receiving bone</u>. The <u>range of motion </u>of this joint is usually <u>wide</u> and has <u>one central point</u>.
The Amino Acid Chain model, also known as polypeptides, are linked together by a <u>peptide bond</u>. A peptide bond is produced by hydrolysis. The chain usually <u>starts with the amino group and ends with the carboxyl group</u>.
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